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  1. or download this
    use strict;
    use warnings;
    use YAPE::Regex::Explain;
    ...
    my $regex2 = qr{Hello\#\ World}x;
    my $parser2 = YAPE::Regex::Explain->new($regex2)->explain;
    print "$parser2\n";
    
  2. or download this
    The regular expression:
    (?x-ims:Hello\#\ World\\E)
    matches as follows:
    ...
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    )                        end of grouping
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